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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Letters of Credit
As of March 31, 2012, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Facility:

Amount
 
Expiration of Letter of Credit (1)
$
382,556

 
December 2012
$
14,782,820

 
February 2013
$
9,033,164

 
June 2012

(1) 
These letter of credit agreements automatically renew for consecutive, one-year periods each anniversary, subject to the satisfaction of the credit obligation and certain other limitations.